What lubricant is used with HFC-134a refrigerant?

HFC-134a refrigerant typically uses polyalkylene glycol (PAG) or polyol ester (POE) lubricants. These synthetic oils are compatible with HFC-134a and provide effective lubrication in refrigeration systems. It's important to avoid mineral oils, as they do not mix well with HFC-134a and can lead to system failures. Always refer to the manufacturer's guidelines for the specific lubricant recommendations for your system.